Grouted anchor structures



Oct. 19, 1965 H. w. OLSEN GROUTED ANCHOR STRUCTURES 2 Sheets-Sheet 2Filed March 1, 1962 INVENTOR Horace W. Olsen United States Patent3,212,269 GROUTED ANCHOR STRUCTURES Horace W. Olsen, 2038 North Blvd.,Houston, Tex. Filed Mar. 1, 1962, Ser. No. 176,526 1 Claim. (Cl. 6136)This invention relates to new and useful improvements in the art ofearth engineering, and in particular, the invention concerns itself withthe installation of cementitiously grouted anchors in cavities providedtherefor in rock, earth or other terrestial formations, either above orbelow ground level.

The principal object of the inveniton is to provide a grouted anchorstructure which is very easy to install, simple in construction, firmand rigid in use, and wherein the cavity grouting operation may beperformed with convenience and expediency. Moreover, the arrangement ofthe invention is such that the cavity packing components may be quicklyand easily removed from one cavity for installation of an anchor inanother cavity, although the packing components may be permitted toremain with the installed anchor in one cavity, if so desired.

Other objects, features and advantages of the invention will becomeapparent from the following description taken in conjunction with theaccompanying drawings, wherein like characters of reference are used todesignate like parts, and wherein:

FIGURE 1 is a vertical elevational view showing a grouted anchorstructure as being installed in a terrestial cavity, including means fordelivering grouting material to the anchor;

FIGURE 2 is a side elevational view of the anchor structure per se on anenlarged scale;

FIGURE 3 is a sectional view, taken substantially in the plane of theline 3-3 in FIGURE 2;

FIGURE 4 is a sectional view, taken substantially in the plane of theline 44 in FIGURE 2;

FIGURE 5 is a sectional view, taken substantially in the plane of theline 55 in FIGURE 2;

FIGURE 6 is a sectional view, .taken substantially in the plane of theline 66 in FIGURE 3; and

FIGURE 7 is a fragmentary sectional view, taken substantially in theplane of the line 77 in FIGURE 2.

Referring now to the accompanying drawings in detail, the referencenumeral 10 in FIGURE 1 generally designates a grouted anchor structureof the invention, being installed in a cavity 11 formed in rock, earth,or other terrestial stratum, either above or below ground level. Theanchor structure 10 comprises a shaft-like anchor element or bolt 12which is inserted into the cavity 11 so as to project outwardlytherefrom. A conduit for grouting material, designated generally by thenumeral 13, includes a tubular outer portion 14 and a hollow,convex-concave body portion 15, the latter being complemental andjuxtaposed to the shaft-like element 12, as is best shown in FIGURES 3and 4. As will be noted, the outer portion 14 of the conduit isdivergent from the shaft-like element 12 and is provided with a cap 34,hereinafter again referred to.

A tubular, axially compressible and radially expansible packing sleeve16 of resilient material such as rubber, or the like, is slidablypositioned on and encircles the element 12 and juxtaposed portion of theconduit 13 and inner and outer pressure pads 17, 18, respectively, areprovided at the respective inner and outer ends of the sleeve 16, andthese pads as well as the sleeve are formed with longitudinal bores toaccommodate a set of tie rods 19 and an air tube 20, the purpose of thelatter being hereinafter more fully described. It will be observed thatthe tie rods 19 are equipped with heads 21 which abut the inner pressurepad 17, as shown.

Means are provided for axially compressing the packing sleeve 16, thesemeans consisting of a substantially U-shaped plate 22 which straddlesthe element 12 in outwardly spaced relation from the outer pad 18 and isequipped with a pair of transversely spaced projections 23 havingconcave fulcrum seats 24 therein for a pair of transversely spaced,complemental rocker portions 25 provided at the ends of a substantiallyU-shaped lever 26. Intermediate regions of the side portions of thelever 26 are formed with protuberances 27 which operatively engage theouter pressure pad 18, while the bight portion of the lever 26 is formedwith a recess 28 to engage a rounded end of an actuating screw 29 whichpasses through a screw-threaded bore 30 in the bight portion of theplate 22.

The lever 26 is provided with recesses 31 to afford clearance for thetie rods 19 and air tube 20, while the plate 22 is formed with notches32 through which the rods 19 and tube 20 extend. The rods 19 areprovided with screw-threaded end portions having nuts 33 thereon,whereby the various parts are held assembled. It will be readilyapparent that when the screw 29 is tightened, the rocker portions 25 ofthe lever 26 will rock in the fulcrum seats 25 and the protuberances 27on the lever 26 will urge the pressure pad 18 toward the pressure pad17, thus axially compressing the packer sleeve 16 therebetween andcausing the latter to expand radially against the wall of the cavity 11in which the anchor element 12 is inserted. The expansion of the sleeve16 is not only radially outwardly, but also radially inwardly, wherebythe sleeve compressively engages the element 12 and juxtaposed portion15 of the conduit 13, whereby to prevent the various parts from slidingalong the shaft-like element 12.

The aforementioned cap 34, provided at the outer end of the portion 14of the conduit 13, is formed with an axial bore or passage 35 whichprovides a seat 36 for a check valve 37 disposed in the conduit portion14. The cap 34 is also equipped with suitable means 38 such as keys, orthe like, for separably engaging a suitable coupling (not shown) at theend of a flexible hose 39, whereby grouting material in a supply hopper40 may be delivered under pressure of a pump 41 driven by a motor 42,through the hose 39 and through the conduit 13 into the cavity 11 whenthe anchor structure 10 is installed in place. Possible back flow of thegrouting material in the conduit 13 is prevented by the check valve 37and any air trapped in the cavity 11, as indicated at 43, will be ventedto the atmosphere through the tube 20, it being understood, of course,that the tube 20 is sufiicienly long to extend inwardly into the closedend portion of the cavity where the air is entrapped.

In the event that the presence of entrapped air in the cavity 11 is notobjectionable, or is desirable from the standpoint of causing thegrouting material to set quickly without shrinkage, the vent tube 20 maybe omitted and another of the tie rods 19 substituted therefor.

The grouting material in the cavity 11 is indicated at 44 and when it isset, the various parts 16-18, 13, 22 and 26 may be removed from theanchor element 12 and applied to another anchor element to be installedin another cavity. Alternatively, the various aforementioned parts maybe permitted to remain in place on the installed anchor element, asdescribed.

While in the foregoing there has been described and shown the preferredembodiment of the invention, various modifications may become apparentto those skilled in the art to which the invention relates. Accordingly,it is not desired to limit the invention to this disclosure and variousmodifications and equivalents may be resorted to, falling within thespirit and scope of the invention as claimed.

What is claimed as new is:

In a grouted anchor structure, the combination of a shaft-like anchorelement having a cylindrical side wall and adapted to be inserted into acavity, a conduit for grouting material separate from said anchorelement, said conduit including an elongated inner portion of aconvexconcave cross-section having its concave side juxtaposed to and incomplemental contact with the cylindrical side wall of said anchorelement and also including a tubular outer portion angularly otfset fromsaid element, an axially compressible and radially expansiblecylindrical packing sleeve of resilient material provided with a singleaxial bore, said anchor element and said juxtaposed inner portion ofsaid conduit extending through said bore of said sleeve, means foraxially compressing and thereby radially expanding said sleeve bothoutwardly into sealing engagement with a cavity wall and inwardly topress said inner conduit portion against said anchor element, said meanscomprising inner and outer pressure pads abutting the respective innerand outer ends of the sleeve, a plurality of tie rods extendinglongitudinally through said sleeve and through said pressure pads, saidtie rods having enlarged inner ends abutting the inner pressure pad tourge the same against the inner end of the sleeve, a substantiallyU-shaped plate straddling said anchor element in a plane spacedoutwardly from the outer pressure pad, said tie rods passing throughsaid plate and having enlarged outer ends at the outside of the plate toprevent movement of the latter outwardly from the outer pressure pad, apair of transversely spaced fulcrum seats provided on one side of saidplate, a substantially U-shaped lever interposed between said plate andsaid outer pressure pad, said lever including a bight portion and a pairof arms straddling said anchor element, said arms terminating in rockerends engaging said fulcum seats, said arms having a pair ofprotuberances engaging said outer pressure pad at diametericallyopposite sides of said anchor element, and an actuating screw providedon the side of said plate opposite from said fulcrum seats, said screwbearing against the bight portion of said lever whereby to axiallycompress said sleeve between said pressure pads when the screw istightened.

References Cited by the Examiner UNITED STATES PATENTS 2,158,829 5/34Miller 285-338 2,152,429 3/39 Cave. 2,313,109 3/43 Wertz 6136 2,667,0371/54 Thomas 6145 2,960,831 11/60 Lonaberger 6l-36 FOREIGN PATENTS664,709 1/52 Great Britain.

84,937 1/ Norway. 84,938 1/55 Norway.

EARL I. WITMER, Primary Examiner.

JACOB L. NACKENOFF, Examiner.

